Note: the Performance Tail Upgrade V2 provides superior tail control for sport and hard 3D flying styles.  With dualflanged, radial ball bearing supported tail grips and a dual radial ball bearing, fully-supported thrust bearing tail rotorassembly, the new upgrade kit provides a truly slop-free, high-performance tail that is rock-solid for all maneuvers.  Thedesign is a simple retrofit for the common Align parts on the helicopter, with the ability to be used on all TREX 550,600E, 600ESP, 600N, 700E, 700N, and 700N E-Conversion series helicopters on the market and installed in a matterof minutes